A wire that explodes upon application of current. It takes the place of
the primary explosive in an electric detonator.
a. Excavate in such a manner as to utilize material in a particular vein
or layer, and waste or avoid surrounding material. Nichols, 1
b. Turn a natural resource to economic account. For example, to exploit a
mineral deposit. Webster 3rd
a. The process of winning or producing from the Earth the oil, gas,
minerals, or rocks that have been found as the result of exploration.
AGI
b. The extraction and utilization of ore.
a. The search for coal, mineral, or ore by (1) geological surveys; (2)
geophysical prospecting (may be ground, aerial, or both); (3) boreholes
and trial pits; or (4) surface or underground headings, drifts, or
tunnels. Exploration aims at locating the presence of economic deposits
and establishing their nature, shape, and grade, and the investigation may
be divided into (1) preliminary and (2) final.
See also:preliminary exploration
Nelson
b. A mode of acquiring rights to mining claims.
Drilling boreholes by the rotary, diamond, percussive, or any other method
of drilling for geologic information or in search of a mineral deposit.
Long
A drift that is driven in an ore deposit for the purpose of exploring the
deposit both horizontally and vertically to see whether it will be worth
working. Stoces
The drilling of boreholes from the surface or from underground workings,
to seek and locate coal or mineral deposits and to establish geological
structure. Exploratory drilling is frequently done from underground
workings, the holes being drilled upward, horizontally, or downward as
required. For underground drilling, roller bits, diamond crowns, or
tungsten-carbide bits may be used and can be coring or noncoring. Rotary
boring is the predominant method for exploratory work from the surface,
particularly where cores of significant deposits are required.
See also:borehole samples; drill sampling; underground exploration;
diamond drilling. Nelson
Mining operations to determine the size of a deposit, and also its
character along the strike as well as its dip. This is done by making
drives and inclines. These openings follow the deposit both in strike and
dip. They are designed in such a way so as to make it possible to use them
for mining proper should the exploration turn out favorably.
Syn:exploration
See:gale alidade
The working drift approaching old workings whose exact position is
uncertain, bored as a precaution against an unexpected holing.
Peel
Curve lines drawn through coordinating points, indicating ignition or
propagation, in which the rectilinear coordinates of the diagram are
factors of volatile fixed-carbon ratios, total incombustible, density of
dust, size of dust particles, and combustible gases, if any, in the air
current. Rice, 2
The addition of inert dust to coal dust decreases its explosibility, and
when enough has been added an explosion cannot occur. The point at which
explosion cannot occur is said to be the explosibility limit of the coal
in question. Rice, 2
Capable of being exploded. Webster 3rd
The dust deposited from the cloud raised by the explosion, which settles
after the explosion has died down, only part of which may be traversed by
the flame. Sinclair, 1
explosion-hazard investigation
The investigation of a mine to determine the possibility of an explosion
occurring by reason of the kind, size, purity, and dryness of the coal
dust along the mine passages and the presence or absence of combustible
gases. It also determines the degree of the hazard of an explosion from
natural conditions and of one arising through the neglect or ignorance of
the mine personnel. The purpose of such investigations is to make specific
recommendations for reducing that hazard to a negligible point by
appropriate methods and continued diligence. Rice, 2
The pressure developed at the instant of an explosion. Streefkerk
a. The term "explosion-proof casing" or "enclosure" means that it is so
constructed and maintained as to prevent the ignition of gas surrounding
it by any sparks, flashes, or explosions of gas that may occur within such
enclosures. Fay
b. Said of electrical apparatus so designed that an explosion of flammable
gas inside the enclosure will not ignite flammable gas outside. Also
called flameproof. CTD
c. Fitting, motor, switch, or fixture so made and maintained as to
preclude possibility of sparks, arcs, or heat sufficient to initiate
explosion in surrounding air or mine dust. Pryor, 3
The U.S. Bureau of Mines has applied the term "explosion proof" to motors
constructed so as to prevent the ignition of gas surrounding the motor by
any sparks, flashes, or explosions of gas or of gas and coal dust that may
occur within the motor casing. See also:permissible motor
An explosion caused by molten iron coming in contact with water or wet
material. Fay
In explosion-tested equipment, housings for electric parts are designed to
withstand internal explosions of methane-air mixtures without causing
ignition of such mixtures that surround the housings.
A tuff whose pyroclastic fragments are in the place in which they fell,
rather than having been washed into place after they landed. AGI